Counting System
 Para Electronics offers different types of spectroscopy products :  Radiation Monitor
  Preamplifier | Preamp & HV  |Nuclear Gamma Spectrometer | NIM Modules
  1K MCA | 1K MCA with HV & Spectroscopy Amplifier| Spectroscopy
  Programmable Spectrometer Data Acquisition
       

Special Projects
           
 NETS - 0 : Preamplifier

NETS-0 is a preamplifier for Photo Multiplier Tubes with 12 or 14 pin base. NETS-0 is compatible with standard Photo Multiplier tubes. Gain can be adjusted through a single turn potentiometer. Connectors are provided for HV supply, Signal and DC power. NETS-0 is available with two types of packaging: In-line and Base Stand.

Specifications:

  Voltage Divider : 10 or 12 stage with R= 510 K Ohms
  Preamplifier  :  2 stage transistor amplifier with emitter follower
  Gain Adjust  :  Single turn potentiometer
  Signal Output : Pulse Output with sharp rise time and 50µ Sec fall time
  Power Supply : ± 15 V DC
  H.V. Supply Connector : BNC female
  Power Supply Connector : 3 pin female
  Signal Output : BNC female


Model 

Configuration

Power Supply Requirement
NETS-0/VD  12 or 14 pin PMT base with 10 or 12 stage Voltage Divider, DC 
 de-coupled pulse output 		  H.V. Supply as required by PMT
NETS-0  12 or 14 pin PMT base with 10 or 12 stage Voltage Divider,
 Preamplifier pulse output		  H.V. Supply as required by PMT,
 ± 15 V DC
NETS-0 MHC  12 or 14 pin PMT base with 10 or 12 stage Voltage Divider,   
 Preamplifier with Cable Driver, Built-in HV Supply		  ± 15 V DC 


 

 

 NETS-0 MHC : Preamplifier, HV Supply 

 

NETS-0 MHCL, shown here, has a voltage divider, HV supply and preamplifier with cable driver output stage. It has a PMT base socket in which detector can be directly plugged. The output stage is capable of driving signal through a standard coaxial cable up to a maximum length of 100 meters. This unit requires ±15VDC power. HV supply of 1000 V @ 1mA max. for PMT Detectors is generated internally.
Stainless Steel weatherproof enclosure is optionally available for Detector and NETS-0 MHCL assembly. 

Specifications:

  Voltage Divider :  10 or 12 stage with R= 510 K Ohms
  Preamplifier :  2 stage transistor amplifier with emitter follower
  Gain Adjust : Single turn potentiometer
     
  Signal Output : Pulse Output with sharp rise time and 50µ Sec fall time
  Output Impedance : 50 ohms.
  H.V. Supply  : Internally connected to Anode pin through Load Resistor
  H.V. Adjust : Screw driver adjustment for setting H.V. between +100V to +1000 V DC
  H.V. Monitor  : 0 to +5 V output proportional to H.V.
  Power Supply : ± 15 DC @ 150 mAmp
     
  Power Supply Connector : 3 pin female
  Signal Output :  BNC female
  H.V. Monitor Test Points : Test Point jacks


 

 PNS - 2 : Para Nuclear Spectrometer

 

Para Nuclear Spectrometer Model PNS-2 is a micro-controller based, stand alone, Mains operated instrument for NaI(Tl) detector based Gamma Ray Spectroscopy.

PNS-2, along with NaI(Tl) detector of customer’s choice & Model NETS-0, PMT base preamplifier form a complete spectrometry system. This system is suitable for experiments related to absorption studies, half life measurements. This set up is very useful for gross Beta/Gamma counting of environmental samples, with appropriate detector.

PNS-2 contains Spectroscopy Amplifier, SCA, HV supply for detector, power supply for preamplifier and micro based scaler/timer. PNS-2, in its standard configuration, is supplied as preset timer, however it can be configured as Preset Counter with optional software.

PNS-2 can store 1000 readings in a non-volatile memory for data logging. These readings can be downloaded to PC via RS-232 interface or printed via parallel interface. These readings can also be read on LCD display after the counting experiment.

PNS-2 is ideally suited for Nuclear Counting Experiments carried out in University and colleges. It is also useful for radiation counting for health physics applications in radioisotope laboratories, nuclear reactors, nuclear power plants, environmental survey labs, etc.

NaI(Tl) Detector, PMT based Preamplifier, Lead shield around the NaI(Tl) Detector are supplied as an optional accessories for PNS-2. Please inform us your detector and shielding requirements to configure the detector and shield assembly.

Specifications:

   Preamplifier Model NETS-0 ( OPTIONAL)

 Spectroscopy Amplifier    
  Pulse Shaping   : Near Gaussian
  Pole Zero Adjustment   : Adjustable
  Amplification   : Fine Gain x1 to x2 , by ten turn helipot
  Input Polarity   : Positive
  Output Pulse   : +10 V max., unipolar, internally connected to SCA input
  Single Channel Analyzer    
  Input   : Internally connected to Spectroscopy Amplifier output
  Base Line (E)   : 0.1 to + 10 V adjustable by Helipot with calibrated dial
  Window ( E)   : 0.1 to + 2 V adjustable by Helipot with calibrated dial
  Output   : TTL pulse internally connected to counter input
  Mode   : Integral / Window
 Scaler/Timer    
  Scaler   : All solid state, Micro-Controller based design.
  Timer   : Settable between 1 and 9999 seconds in step of 1 sec
  Number of Runs   : Settable between 1 and 1000
  Menu   : User friendly menu to set Preset Time, No. of Runs,
Data Acquisition and Transfer 
  User Interface   : 4 keys keypad with 16x2 line LCD for displaying
Key function
  Display   : Counts : 999999         Time : 9999            Runs : 1000
  Data Storage   : Store and recall facility for data up to 1000 readings  
  Preamp Power   : +/- 15V @ 50mA , 9 Pin D type connector on Rear Panel
  Printer Output   : 25 pin D type connector for centronics type parallel printer
  RS-232 Output   : 9 pin D type female connector for data transfer to PC
  HV Supply   : Adjustable to 1500V by setting front panel mounted
Helipot with calibrated dial
  Power   : 240V (+/-10 V), 50 Hz AC Mains 
      
 Mechanical    
  Dimensions   : 230 L x 220 D x 130 H mm
  Weight   : Approximately 3 kg
     
  Optional Accessories   :  NaI(Tl) Detector, Lead Shield

 

 

 NETS-3M : 1K Multichannel Analyzer 

 

 

NETS-3M is a stand alone Multi Channel Analyser which uses a Wilkinson type 6 MHz ADC, 1024 channels /data Memory with 64 K counts capacity and functional key switches for Data Acquisition, Display and Processing. NETS-3M is equipped with backlit Graphics Liquid Crystal Display (LCD) to monitor data acquisition process. 

NETS-3M is provided with RS232 serial interface for data transfer to a Personal Computer for advanced data processing and spectrum display. 

 

Specifications:

  Data Memory
 1024 channels, 64K counts per channel, 9999 counts numeric display per channel
  ADC

10 Bit, 6.14 MHz Wilkinson type. Input pulse rise/fall 1 msec, 8,4, and 2 volts full scale ranges, LLD 50 mVolts to 4 Volts adjustable. Dead time indication by LED brightness, ADC ON/OFF by function keys and toggle switch. 6 KHz input pulse rate maximum.
  Display

Backlit graphics LCD for spectrum display. 114mm x 64mm view area. 240 x 128 dot matrix display.

256 points resolution on X & Y axes. X axis displays 64 to 1024 channels full scale in 5 settings. Y axis displays 256 to 64K counts full scale in 9 settings. Selectable cursor displayed by 5 vertical dots. Scale display by horizontal 5 dots. 

Display vertical scale is automatically adjusted to optimum value during acquisition and reset to display undistorted spectrum. 
 
  Software

NETS-3M includes Windows based Spectrum Analysis software package PSAS/W. This software enables user to transfer the acquired spectrum to a PC through COM port and carry out the Spectrum Analysis. All the necessary functions such as Spectrum Smoothing, Normalization, Peak Calculations, ROI Set/Reset are part of the PSAS/W package. Printing and storage of spectra are provided to enable user to save the data or print the spectrum/data as per his requirement. This user friendly software package offers itself as a handy tool for Spectrum Analysis.


 

 NETS-3 MU : 1K Multichannel Analyzer with HV Supply & Spectroscopy Amplifier

 


NETS-3M/U is a 1K Multichannel Analyzer with HV Supply and Spectroscopy Amplifier. It is a mains operated instrument for NaI(Tl) detector based spectroscopy.

NETS3M/U along with NaI(Tl) detector of Customer’s choice and Preamplifier (NETS-0M) form a complete Spectroscopy System. The whole setup has a resolution of around 8%. It is suitable for applications where low resolution of nuclides is acceptable.

NETS-3M/U is ideally suited for Nuclear Spectroscopy experiments carried out at Universities, Environmental Survey Labs and Health Physics Units of Nuclear Power Plants and Chemical Control Labs.  

NETS-3M/U uses a Wilkinson type 6 MHz ADC with 64K counts capacity per channel. It is equipped with backlit graphics Liquid Crystal Display (LCD) to monitor data acquisition and perform data analysis. Data analysis includes the Centroid and FWHM calculation. User can analyse the ROI in the unit itself without need for a PC. At a time, maximum 10 ROIs can be set. This MCA also has a facility to calibrate the spectrum. Straight Line method (y=mx + c) is used for calibration.

NETS-3M/U supports serial communication. A software package (NETSWIN) will be supplied at free of cost to the users along with the MCA. This package operates on Windows 98/XP/2K operating system. This package can control the data acquisition using real time clock of the PC. This facility makes it useful for experiments where the experiment time is more than 10 to 12 hours. User can set the experiment time and start the acquisition. The package automatically halts the acquisition once the acquisition time is over.

NETS-3MU can be supplied optionally with built-in preset Timer with Live/Real time selection. The time is settable between 1 to 9999 secs.

Specifications:

 Spectroscopy Amplifier
  Input Polarity : Positive /Negative
  Shaping Time Constant : 2 µsecs
  Pulse Shape  :  Unipolar, Near Gaussian
  Gain : Coarse : x1 to x2 High/Low selection switch on front panel
Fine : x1 to x 5, Adjustable through 10 turn helipot on front panel
Normal : Around 50
  Base Line Restoration  :  Available
 High Voltage Supply
  Output  : 0 to +1500 V @ 500 µA max adjustable through 10 turn helipot on the front panel
 Low Voltage Power Supply for Preamplifier
  Output : ±15V as required by preamplifier
 1 K Channel MCA
  Data Memory : 1024 channels, 64K counts per channel
  ADC : 0 Bit, 6.14 MHz Wilkinson type, 2/4/8 V full scale range, LLD 50 mVolts to 4 Volts adjustable. Dead time indication by LED brightness
  Display : 320 x 240 pixels Graphics LCD for spectrum display and data analysis.

 

KeyBoard

Cursor Keys : CURR, CURL, FAST, HOME, MAX, ENTER keys to move the cursor right, left, fast movement and home channel, first peak channel from current position and to set the parameter e.g. Start Channel respectively.

Display Keys : SCLU, SCLD, SCRL, SCRR, EXP, CNT, REFRESH keys to adjust the vertical scale (Up or down), Scroll the screen (left or right), expand the screen or contract the screen, refresh the display respectively.

Function Keys : MODE, SMOTH, TOTAL, CLEAR keys to select the operation mode, Smooth the spectrum, ROI calculations and clear the channel data respectively.
 

In this new version of MCA, user can perform ROI analysis without a need for PC. NETS-3M/U has different modes of operation. In Setup mode, user can set the ROI start and stop channel using Cursor keys. Maximum 10 ROIs can be set at a time.

In Run mode, User can acquire the spectrum and perform peak analysis. ROI integral, background, area, centroid, %error and FWHM are calculated and displayed on the screen.

In calibrate mode, user can calibrate the spectrum. Straight Line method (y=mx + c) is used for calibration. After calibration, energy value is displayed along with channel number.
 

ACCESSORIES

For most of the users, we have supplied NaI(Tl) detector with MCA. Detector size depends upon the application. Usually the size varies from 2”x2” to 5”x3”.

Along with the MCA, we can supply the preamplifier (Model – NETS-0M). The preamplifier has built in Voltage Divider Chain (10 or 12 stage with R=510K) and 2 stage transistor amplifier with emitter follower.

Preset Timer is optionally available with MCA. This Timer has a Real time/Live Time selection switch. In Live mode, the timer stretches the acquisition time to compensate for the Dead time of MCA.

For low activity samples, the background plays important role. For such applications, proper shielding is necessary. Lead shields as per user requirement and application can be supplied.

Software :

NETS-3M/U includes Windows based Spectrum Analysis Software package. This software enables user to transfer the acquired spectrum to PC on serial port and carry out the Spectrum Analysis. All the necessary functions such as Spectrum Smoothing, Normalization, Peak Calculations, ROI Set/Reset are part of the software. Other facilities include Spectrum Calibration, Printing and Storage of Spectrum.

This package makes use of real time clock of the PC. User can set the acquisition time and number of runs. After completion of each run, data automatically gets transferred to PC. This feature is useful when the experiment time is in hours.

 

We can customize this package as per the user requirement. For example, the report format can be changed if desired. For ESL Tarapur, we have provided additional facility to perform Cumulative Effective Dose (CED) calculations. CED report is generated for all the regular employees and contract people. All the data is finally stored in a common report file.

 

 

 PPS - 1 : Para Programmable Spectrometer

 

Para Programmable Spectrometer, Model PPS-1 is a Micro-controller based mains operated, PC controlled instrument suitable for Counting Applications. 

PPS-1, along with NaI(Tl) detector & PMT preamplifier, Model NETS-0M form a complete spectroscopy system. This system is suitable for experiments related to absorption studies, half life measurements. With an appropriate detector, this setup is useful for gross Gamma counting of environmental samples.

It enables user to fix the parameters like Coarse Gain, HV, LLD or Window level of the system for required isotope being used on regular basis. These parameters for different radio isotopes are stored on PC. At the beginning, keep the radio isotope of interest. Through software package supplied with the instrument, user can adjust High Voltage of Detector, Coarse Gain of Amplifier, Threshold and Window level of SCA. After setting of the instrument, user can store all these parameters in a file. Likewise user can fix the parameters for different radio isotopes and save them in file format. Later on, whenever the radio isotope is changed, reload the file for the radio isotope of interest. The software package will transfer the parameter values to instrument through serial communication. The instrument will automatically adjust all its parameters for the selected radio isotope.

PPS-1, consists of Spectroscopy Amplifier, SCA, HV supply for detector. Analog switches are used in Spectroscopy Amplifier to control the Coarse Gain of the Amplifier. Fine gain of the amplifier is adjustable through 10 turn helipot on front panel. 8 BIT DACs are used to adjust High Voltage, Threshold and Window Set Point.

NaI(Tl) Detector, PMT Preamplifier, Lead Shield for NaI(Tl) detector are supplied as optional accessories for PPS-1. Detector and shield assembly are supplied as per user requirement.

 

Specifications:

 Spectroscopy Amplifier
  Input : Output signal from pre-amplifier
  Input Polarity :  Positive
  Shaping : 0.5 µsec / 1 µsec near Gaussian (Internal jumper selection)
  Gain : x300 Overall
  Coarse Gain   :  x1, x2, x4 and x8 selection through serial port
  Fine Gain : Adjustable through 10 turn heliopt with dial
  Base Line restoration  :  Available internally
  Output : Unipolar positive shaped semi gaussion pulse
  Pulse Amplitude : Program controlled between 0 and 10 volts
    (EMI Shielding is provided between Amplifier and HV supply
    Coarse : High/Low (internally settable)
Fine : 5:1 in the set range
     
  Time Constant : 1 µsec
  Pulse Shape :  Unipolar, Near Gaussian
  Gain : High/Low (internally settable)
Fine : 5:1 in the set range
  Output Pulse  :  0 to 10 V max (settable through Gain Adj) Connected internally to NETS-3 MCA
  Input Connector  :  BNC female connector
     
 High Voltage Supply
  Output  : 0 to +1000 V @ 1 mA max (0 to 1500 V @ 1mA optional)
  Output Adjust :  Continuously adjustable through 10 turn helipot with calibrated dial
  Output Connector : UHF female
     
 Low Voltage Power Supply for Preamplifier
  Output : ±15V as required by preamplifier
  Output Connector : 3 pin connector 


   

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